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FHWA Home / Safety / Speed Management / State Practices to Reduce Wet Weather Skidding Crashes

State Practices to Reduce Wet Weather Skidding Crashes

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Federal Highway Administration
Office of Safety
1200 New Jersey Avenue, SE
Washington, DC 20590
www.fhwa.dot.gov

U.S. Department of Transportation logo

May 20, 2011

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Notice

This document is disseminated under the sponsorship of the U.S. Department of Transportation in the interest of information exchange. The U.S. Government assumes no liability for the use of the information contained in this document. This report does not constitute a standard, specification, or regulation.

The U.S. Government does not endorse products or manufacturers. Trademarks or manufacturers’ names may appear in this report only because they are considered essential to the objective of the document.

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The Federal Highway Administration (FHWA) provides high-quality information to serve Government, industry, and the public in a manner that promotes public understanding. Standards and policies are used to ensure and maximize the quality, objectivity, utility, and integrity of its information. FHWA periodically reviews quality issues and adjusts its programs and processes to ensure continuous quality improvement.

Technical Report Documentation Page

1. Report No.

FHWA-SA-11-21

2. Government Accession No.

3. Recipient’s Catalog No.

4. Title and Subtitle

State Practices to Reduce Wet Weather Skidding Crashes

5. Report Date

May 2011

6. Performing Organization Code

7. Author(s)

Colleen McGovern, Peter Rusch, David A. Noyce

8. Performing Organization Report No.

9. Performing Organization Name and Address

Cambridge Systematics, Inc.
100 Cambridge Park Drive, Suite 400
Cambridge, MA 02140

10. Work Unit No.

11. Contract or Grant No.

DTFH6-05-D-00026-T-10003

12. Sponsoring Agency Name and Address

U.S. Department of Transportation
Federal Highway Administration
Office of Safety
1200 New Jersey Avenue, SE
Washington, DC 20590

13. Type of Report and Period Covered

Final Report

14. Sponsoring Agency Code

15. Supplementary Notes

The Contract Manager for this report was Guan Xu (Office of Safety Technologies). Additional technical oversight provided by: Joseph Cheung (Office of Safety), Richard Knoblauch (Office of Research, Development, and Technology), Roya Amjadi (Office of Safety Research and Development), Mike Moravec (Office of Pavement Technology), Craig Allred (Resource Center).

16. Abstract

This report provides guidance to states for implementing a program focused on reducing wet weather skidding crashes and identifies the four common components of existing state programs. These components include identification of wet pavement crashes, friction testing procedures, investigation and remedial action of wet pavement crash locations, and project/program evaluations. The report identifies existing guidance from the Federal Highway Administration (FHWA) and the American Association of State Highway Transportation Officials (AASHTO) related to each of the four components. It also provides detailed case studies on existing state programs in California, Florida, Michigan, New York, and Virginia, all of which have shown success in reducing wet weather skidding crashes. The report concludes with a comparison of the five state programs and identifies common procedures for each of the four program components. This report provides states with valuable information to launch a wet weather crash reduction program or to improve an existing program.

17. Key Words

Wet weather crash reduction program, pavement friction, pavement friction treatments

18. Distribution Statement

No restrictions. This document is available to the public through the National Technical Information Service, Springfield, VA 22161.

19. Security Classif. (of this report)

Unclassified

20. Security Classif.
(of this page)

Unclassified

21. No of Pages

42

22. Price

N/A

Form DOT F 1700.7 (8-72)                                                                       Reproduction of completed pages authorized

Metric Conversion Factors
(International System of Units)

APPROXIMATE CONVERSIONS TO SI UNITS
SYMBOL WHEN YOU KNOW MULTIPLY BY TO FIND SYMBOL
LENGTH
in inches 25.4 millimeters mm
ft feet 0.305 meters m
yd yards 0.914 meters m
mi miles 1.61 kilometers km
AREA
in2 square inches 645.2 square millimeters mm2
ft2 square feet 0.093 square meters m2
yd2 square yard 0.836 square meters m2
ac acres 0.405 hectares ha
mi2 square miles 2.59 square kilometers km2
VOLUME
fl oz fluid ounces 29.57 milliliters mL
gal gallons 3.785 liters L
ft3 cubic feet 0.028 cubic meters m3
yd3 cubic yards 0.765 cubic meters m3
NOTE: volumes greater than 1000 L shall be shown in m3
MASS
oz ounces 28.35 grams g
lb pounds 0.454 kilograms kg
T short tons (2000 lb) 0.907 megagrams (or "metric ton") Mg (or"t")
TEMPERATURE (exact degrees)
oF Fahrenheit 5 (F-32)/9 or (F-32)/1.8 Celsius oC
ILLUMINATION
fc foot-candles 10.76 lux lx
fl foot-Lamberts 3.426 candela/m2 cd/m2
FORCE and PRESSURE or STRESS
lbf poundforce 4.45 newtons N
lbf/in2 poundforce per square inch 6.89 kilopascals kPa

 

APPROXIMATE CONVERSIONS FROM SI UNITS
SYMBOL WHEN YOU KNOW MULTIPLY BY TO FIND SYMBOL
LENGTH
mm millimeters 0.039 inches in
m meters 3.28 feet ft
m meters 1.09 yards yd
km kilometers

0.621

miles mi
AREA
mm2 square millimeters

0.0016

square inches in2
m2 square meters 10.764 square feet ft2
m2 square meters

1.195

square yards yd2
ha hectares

2.47

acres ac
km2 square kilometers

0.386

square miles mi2
VOLUME
mL milliliters 0.034 fluid ounces fl oz
L liters 0.264 gallons gal
m3 cubic meters 35.314 cubic feet ft3
m3 cubic meters 1.307 cubic yards yd3
MASS
g grams 0.035 ounces oz
kg< kilograms 2.202 pounds lb
Mg(or "t") megagrams (or "metric ton") 1.103 short tons (2000 lb) T
TEMPERATURE (exact degrees)
oC Celsius 1.8C+32 Fahrenheit oF
ILLUMINATION
lx lux 0.0929 foot-candles fc
cd/m2 candela/m2 0.2919 foot-Lamberts fl
FORCE and PRESSURE or STRESS
N newtons 0.225 poundforce lbf
kPa kilopascals 0.145 poundforce per square inch lbf/in2

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Page last modified on October 15, 2014.
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